%I #4 Mar 30 2012 18:56:20
%S 3,15,33,46,48,50,51,52,54,56,58,60,62,69,87,105,123,141,162,189,216,
%T 235,238,241,243,244,247,250,253,256,259,270,297,324,351,378,405,432,
%U 459,478,481,484,486,487,490,493,496,499,502
%N Position of n-th 3 in A031087.
%K nonn
%O 1,1
%A _Clark Kimberling_
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